we bought the 1,2,4-trichlorobenzene which was liquid and after the first series of experimentation in the lab, we conserve the rest of the chemical in the fridge at 4°C. But I tried to used it for a second experiment but i noticed that it has become solid maybe because of the winter. What is the appropriate process to have it liquid? can we heat it or is it possible to remove it from the fridge for long time ?